Folks,
here is a list of sensors to build a complete weather station based on
T238+ modem2
Sensors verified to work with it, by George Chrysostomou, SV2DOF
1 Anemometer (Wind speed/direction)
TAI-8515 V3 Wind Instrument from AAG Electronica
Works OK, by default.
2 Humidity / Temperature
TAI-8540 1-Wire Humidity Sensor from AAG Electronica
Works OK.
3 Rain-Gauge
RG1-R1-A from Hobby-Boards. It is a RAINEW tipping bucket rain
collector from RainWise, modified by Hobby-Boards with the addition of a
1-Wire Dual Counter DC2.5-R1-A (DS2423).
Works OK, ONLY if both counter inputs A and B are connected together.
4 Barometer
* B1-R1-A from Hobby-Boards. It is a Bray design, based on
Motorola/Freescale MPX4115A sensor, as modified by Tim Bitson. It has a
single instrumentation op-amp (INA-122) with fixed gain to x10. Needs at
least 14Vdc for operation.
Works OK, ONLY if Vref is set to MPX4115A's Vout @ 931mBar (5.1V P.S.),
3.789V and gain is adjusted to 15.10852 (actually to 15.10333) by adding
a resistor of 39k in parallel of R1(=40.2k)
The following baro sensor tried but DID NOT WORK
* TAI-8570 1-Wire Pressure Sensor from AAG Electronica
Does NOT work. It is found and read but the indicated value is
erroneous. It has built-in calibration table but needs special
procedures, not currently supported, to read the correct calibrated
pressure value.
73 de George, SV2DOF
____________________________________________________________________
http://www.freemail.gr - δωρεάν υπηρεσία ηλεκτρονικού ταχυδρομείου.
http://www.freemail.gr - free email service for the Greek-speaking.